Add initial `spack.yaml` and `config` #16

Job	Run time
Closed	0s
Comment	0s
CI / Set Defaults	1s
CI / Check Config Fields	10s
CI / Check spack.yaml	9s
CI / Get Version and Tag Prerelease	0s
CI / Notifier	0s
CI / Deploy to Prerelease	0s
	20s

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